Tucson is in the Sonoran Desert. We have a vast assortment of native cactus, trees, and such, but it is still a desert, so no lush greenery. Except, where you find an oasis. Aqua Caliente is such a place. It is fed by it's name sake hot spring, Aqua Caliente, Hot Water. It was first part of a cattle ranch, then a place for tourists to soak in the warm waters for their health, then back to a ranch, and finally, a park belonging to Pima County. A great place to walk around, sit and watch the ducks, or even a picnic.